Micropatterned T Cell Activation Surfaces to Limit Exhaustion
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Solution Overview
Problem
Existing methods for ex vivo activation and expansion of T cells for adoptive immunotherapy, such as using magnetic beads, fail to replicate the microscale interactions and mechanical features of T cells with their targets in vivo, leading to inefficient activation, potential cell damage, and increased risk of exhaustion.
Innovation Solution
Micropatterned surfaces with soft elastomer pillars, characterized by specific dimensions and elasticity, mimic the in vivo environment to enhance T cell activation and expansion, using functionalized ligands to stimulate CD3 and CD28 receptors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic beads are used for T cell activation, then T cell activation can be achieved, but the physical features of in vivo T cell-target interface are not reproduced
Solution Approach 1:
The patent changes the physical parameters of the activation surface by creating micropatterned structures with specific geometries (pillars, protrusions) that mimic the microvilli topology of natural target cells. This transforms the flat bead surface into a three-dimensional micropatterned surface that reproduces the physical features of in vivo T cell-target interface, thereby resolving the contradiction between activation effectiveness and adaptability to in vivo conditions
Solution Approach 2:
The patent creates artificial micropatterned surfaces that copy the physical topology of natural target cell surfaces, specifically replicating the microvilli structures that T cells interact with in vivo. By copying these essential physical features, the artificial surfaces provide authentic activation signals while maintaining the benefits of controlled in vitro conditions
2Reliability
If prolonged incubation with increased bead concentration is used, then T cell activation may be enhanced, but nonspecific binding and cell trapping/damage increase
Solution Approach 1:
The patent applies local quality by creating micropatterned structures with specific local geometries (pillars, protrusions) that concentrate activation signals at defined locations. This localized activation approach enhances T cell stimulation efficiency while reducing the need for high bead concentrations, thereby minimizing nonspecific binding and cell damage that occur with prolonged incubation
3Ease of operation
If commercially available beads are used, then T cell activation can be performed, but the microscale features of T cell microvilli are not replicated
Solution Approach 1:
The patent segments the activation surface into micropatterned structures (pillars, protrusions) that individually replicate microvilli features. This segmentation approach maintains ease of operation by using bead-like structures that can be easily handled, while simultaneously achieving high manufacturing precision in replicating microscale features through controlled fabrication processes
Data Source
AI summary
Disclosed herein are micropatterned surfaces, particularly in the shape of micro-brushes having a base and a plurality of elongated elements. The micropatterned surfaces suitably biofunctionalized are particularly useful for activation and expansion of cells. Methods for activation and expansion of cytotoxic lymphocytes with decreased exhaustion potential are also provided, as well as means involving same to treat a patient in need thereof.